(x+3)(x-5)=x*x+7

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Solution for (x+3)(x-5)=x*x+7 equation:


Simplifying
(x + 3)(x + -5) = x * x + 7

Reorder the terms:
(3 + x)(x + -5) = x * x + 7

Reorder the terms:
(3 + x)(-5 + x) = x * x + 7

Multiply (3 + x) * (-5 + x)
(3(-5 + x) + x(-5 + x)) = x * x + 7
((-5 * 3 + x * 3) + x(-5 + x)) = x * x + 7
((-15 + 3x) + x(-5 + x)) = x * x + 7
(-15 + 3x + (-5 * x + x * x)) = x * x + 7
(-15 + 3x + (-5x + x2)) = x * x + 7

Combine like terms: 3x + -5x = -2x
(-15 + -2x + x2) = x * x + 7

Multiply x * x
-15 + -2x + x2 = x2 + 7

Reorder the terms:
-15 + -2x + x2 = 7 + x2

Add '-1x2' to each side of the equation.
-15 + -2x + x2 + -1x2 = 7 + x2 + -1x2

Combine like terms: x2 + -1x2 = 0
-15 + -2x + 0 = 7 + x2 + -1x2
-15 + -2x = 7 + x2 + -1x2

Combine like terms: x2 + -1x2 = 0
-15 + -2x = 7 + 0
-15 + -2x = 7

Solving
-15 + -2x = 7

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '15' to each side of the equation.
-15 + 15 + -2x = 7 + 15

Combine like terms: -15 + 15 = 0
0 + -2x = 7 + 15
-2x = 7 + 15

Combine like terms: 7 + 15 = 22
-2x = 22

Divide each side by '-2'.
x = -11

Simplifying
x = -11

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